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From: "chrishair85 at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/101030] New: gcc internal error with Wconversion
Date: Fri, 11 Jun 2021 12:24:30 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101030

            Bug ID: 101030
           Summary: gcc internal error with Wconversion
           Product: gcc
           Version: 11.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: chrishair85 at gmail dot com
  Target Milestone: ---

template <int N>
struct jj {
    int ii[N ?: 1];
};

int main() {
    jj<2> kk;
}

g++ -Wconversion dies with
version 8 to 11

changing template<int N> to template<unsigned long N> makes it work

Regards

<source>:4:18: internal compiler error: Segmentation fault
    4 |     int ii[N ?: 1];
      |                  ^
0x1780bf9 internal_error(char const*, ...)
        ???:0
0x6d96a9 cp_convert_and_check(tree_node*, tree_node*, int)
        ???:0
0x6f2dc8 grokdeclarator(cp_declarator const*, cp_decl_specifier_seq*,
decl_context, int, tree_node**)
        ???:0
0x707dd4 grokfield(cp_declarator const*, cp_decl_specifier_seq*, tree_node*,
bool, tree_node*, tree_node*)
        ???:0
0x7c0cab c_parse_file()
        ???:0
0x892aa2 c_common_parse_file()
        ???:0
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
Compiler returned: 1

Rgds=